'serendipity_lang_ru.inc.php' already is in UTF-8. Leaving untouched.
iconv -f ISO-8859-1 -t UTF-8 -o serendipity_lang_de.inc.php.new serendipity_lang_de.inc.php
iconv -f ISO-8859-1 -t UTF-8 -o serendipity_lang_da.inc.php.new serendipity_lang_da.inc.php
iconv -f ISO-8859-1 -t UTF-8 -o serendipity_lang_fr.inc.php.new serendipity_lang_fr.inc.php
iconv -f ISO-8859-1 -t UTF-8 -o serendipity_lang_se.inc.php.new serendipity_lang_se.inc.php
iconv -f cp1256 -t UTF-8 -o serendipity_lang_sa.inc.php.new serendipity_lang_sa.inc.php